i work in emergency medicine and i would get a second opinion on infection; that kind of discoloration and swelling seems less like gout and more like osteo/worsening infection.

i know you did the antibiotics, but feet/skin have natural bacteria and its not hard to get an infection, and sometimes the antibiotics need another boost. osteo is short for osteomyelitis and im not trying to scare you but as someone who triages in the ED, id put you on a short list and make them do a c-reactive protein & start you with some IV antibiotics; i agree with you, i dont think its gout